diff --git a/oauth2_http/javatests/com/google/auth/oauth2/AppEngineCredentialsTest.java b/oauth2_http/javatests/com/google/auth/oauth2/AppEngineCredentialsTest.java
index 947277ee6..a13522a60 100644
--- a/oauth2_http/javatests/com/google/auth/oauth2/AppEngineCredentialsTest.java
+++ b/oauth2_http/javatests/com/google/auth/oauth2/AppEngineCredentialsTest.java
@@ -48,7 +48,10 @@
 import java.util.List;
 import java.util.Map;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
 
+@RunWith(JUnit4.class)
 public class AppEngineCredentialsTest extends BaseSerializationTest {
 
   private static final String EXPECTED_ACCESS_TOKEN = "ExpectedAccessToken";
diff --git a/oauth2_http/javatests/com/google/auth/oauth2/JwtClaimsTest.java b/oauth2_http/javatests/com/google/auth/oauth2/JwtClaimsTest.java
index 8bb27f186..b67f110de 100644
--- a/oauth2_http/javatests/com/google/auth/oauth2/JwtClaimsTest.java
+++ b/oauth2_http/javatests/com/google/auth/oauth2/JwtClaimsTest.java
@@ -36,7 +36,10 @@
 import java.util.Collections;
 import java.util.Map;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
 
+@RunWith(JUnit4.class)
 public class JwtClaimsTest {
 
   @Test
diff --git a/oauth2_http/javatests/com/google/auth/oauth2/JwtCredentialsTest.java b/oauth2_http/javatests/com/google/auth/oauth2/JwtCredentialsTest.java
index b7f328951..4b68ce1ea 100644
--- a/oauth2_http/javatests/com/google/auth/oauth2/JwtCredentialsTest.java
+++ b/oauth2_http/javatests/com/google/auth/oauth2/JwtCredentialsTest.java
@@ -48,7 +48,10 @@
 import java.util.List;
 import java.util.Map;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
 
+@RunWith(JUnit4.class)
 public class JwtCredentialsTest extends BaseSerializationTest {
   private static final String PRIVATE_KEY_ID = "d84a4fefcf50791d4a90f2d7af17469d6282df9d";
   private static final String PRIVATE_KEY =
diff --git a/oauth2_http/javatests/com/google/auth/oauth2/TokenVerifierTest.java b/oauth2_http/javatests/com/google/auth/oauth2/TokenVerifierTest.java
index cc596b4de..7255be4c3 100644
--- a/oauth2_http/javatests/com/google/auth/oauth2/TokenVerifierTest.java
+++ b/oauth2_http/javatests/com/google/auth/oauth2/TokenVerifierTest.java
@@ -51,7 +51,10 @@
 import java.util.Arrays;
 import java.util.List;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
 
+@RunWith(JUnit4.class)
 public class TokenVerifierTest {
   private static final String ES256_TOKEN =
       "eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6Im1wZjBEQSJ9.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.yKNtdFY5EKkRboYNexBdfugzLhC3VuGyFcuFYA8kgpxMqfyxa41zkML68hYKrWu2kOBTUW95UnbGpsIi_u1fiA";